Random pattern of bricks distribusion

Hello guys!

I  just installed Grasshopper on my comp and trying to figure out how to make this pattern: 

I found one definition here which distributes lines in one plane randomly, which is very helpful, but I also need these short (vertical) divisions, and I also need them to be extruded at random heights. 

I found tut on youtube about later.

So, I have two parts out of three and have no idea how to out them together :) can somebody please help me?

Thanks!

Olesya